js: fix core.Object, output order, static const fields

test/codegen/expect/dart/isolate.js

 var isolate;
 (function(exports) {
   'use strict';
-  class IsolateSpawnException extends dart.Object {
+  class Capability extends core.Object {
+    Capability() {
+      return new _isolate_helper.CapabilityImpl();
+    }
+  }
+  class IsolateSpawnException extends core.Object {
     IsolateSpawnException(message) {
       this.message = message;
     }
     toString() {
       return `IsolateSpawnException: ${this.message}`;
     }
   }
   let _pause = Symbol('_pause');
-  class Isolate extends dart.Object {
+  class Isolate extends core.Object {
     Isolate(controlPort, opt$) {
       let pauseCapability = opt$.pauseCapability === void 0 ? null : opt$.pauseCapability;
       let terminateCapability = opt$.terminateCapability === void 0 ? null : opt$.terminateCapability;
       this.controlPort = controlPort;
       this.pauseCapability = pauseCapability;
       this.terminateCapability = terminateCapability;
     }
     static get current() {
       return dart.as(_currentIsolateCache, Isolate);
     }
@@ skipping 64 matching lines @@
     }
     setErrorsFatal(errorsAreFatal) {
       let message = new core.List(3);
       dart.dsetindex(message, 0, "set-errors-fatal");
       dart.dsetindex(message, 1, this.terminateCapability);
       dart.dsetindex(message, 2, errorsAreFatal);
       this.controlPort.send(message);
     }
     kill(priority) {
       if (priority === void 0)
-        priority = BEFORE_NEXT_EVENT;
+        priority = Isolate.BEFORE_NEXT_EVENT;
       this.controlPort.send(new List.from(["kill", this.terminateCapability, priority]));
     }
     ping(responsePort, pingType) {
       if (pingType === void 0)
-        pingType = IMMEDIATE;
+        pingType = Isolate.IMMEDIATE;
       let message = new core.List(3);
       dart.dsetindex(message, 0, "ping");
       dart.dsetindex(message, 1, responsePort);
       dart.dsetindex(message, 2, pingType);
       this.controlPort.send(message);
     }
     addErrorListener(port) {
       let message = new core.List(2);
       dart.dsetindex(message, 0, "getErrors");
       dart.dsetindex(message, 1, port);
@@ skipping 27 matching lines @@
     }
   }
   Isolate.IMMEDIATE = 0;
   Isolate.BEFORE_NEXT_EVENT = 1;
   Isolate.AS_EVENT = 2;
   dart.defineLazyProperties(Isolate, {
     get _currentIsolateCache() {
       return _isolate_helper.IsolateNatives.currentIsolate;
     }
   });
-  class SendPort extends dart.Object {
+  class SendPort extends core.Object {
   }
-  class ReceivePort extends dart.Object {
+  class ReceivePort extends core.Object {
     ReceivePort() {
       return new _isolate_helper.ReceivePortImpl();
     }
     ReceivePort$fromRawReceivePort(rawPort) {
       return new _isolate_helper.ReceivePortImpl.fromRawReceivePort(rawPort);
     }
   }
   dart.defineNamedConstructor(ReceivePort, 'fromRawReceivePort');
-  class RawReceivePort extends dart.Object {
+  class RawReceivePort extends core.Object {
     RawReceivePort(handler) {
       if (handler === void 0)
         handler = null;
       return new _isolate_helper.RawReceivePortImpl(handler);
     }
   }
-  class _IsolateUnhandledException extends dart.Object {
+  class _IsolateUnhandledException extends core.Object {
     _IsolateUnhandledException(message, source, stackTrace) {
       this.message = message;
       this.source = source;
       this.stackTrace = stackTrace;
     }
     toString() {
       return 'IsolateUnhandledException: exception while handling message: ' + `${this.message} \n  ` + `${dart.dinvoke(dart.dinvoke(this.source, 'toString'), 'replaceAll', "\n", "\n  ")}\n` + 'original stack trace:\n  ' + `${this.stackTrace.toString().replaceAll("\n", "\n  ")}`;
     }
   }
   let _description = Symbol('_description');
-  class RemoteError extends dart.Object {
+  class RemoteError extends core.Object {
     RemoteError(description, stackDescription) {
       this[_description] = description;
       this.stackTrace = new _RemoteStackTrace(stackDescription);
     }
     toString() {
       return this[_description];
     }
   }
   let _trace = Symbol('_trace');
-  class _RemoteStackTrace extends dart.Object {
+  class _RemoteStackTrace extends core.Object {
     _RemoteStackTrace($_trace) {
       this[_trace] = $_trace;
     }
     toString() {
       return this[_trace];
     }
   }
-  class Capability extends dart.Object {
-    Capability() {
-      return new _isolate_helper.CapabilityImpl();
-    }
-  }
   // Exports:
+  exports.Capability = Capability;
   exports.IsolateSpawnException = IsolateSpawnException;
   exports.Isolate = Isolate;
   exports.SendPort = SendPort;
   exports.ReceivePort = ReceivePort;
   exports.RawReceivePort = RawReceivePort;
   exports.RemoteError = RemoteError;
-  exports.Capability = Capability;
 })(isolate || (isolate = {}));